1243410139 has 2 divisors, whose sum is σ = 1243410140. Its totient is φ = 1243410138.

The previous prime is 1243410079. The next prime is 1243410143. The reversal of 1243410139 is 9310143421.

It is a strong prime.

It is an emirp because it is prime and its reverse (9310143421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243410139 - 2²⁵ = 1209855707 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243410439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621705069 + 621705070.

It is an arithmetic number, because the mean of its divisors is an integer number (621705070).

Almost surely, 2^1243410139 is an apocalyptic number.

1243410139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243410139 is an equidigital number, since it uses as much as digits as its factorization.

1243410139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1243410139 is about 35262.0211984509. The cubic root of 1243410139 is about 1075.3210186756.

The spelling of 1243410139 in words is "one billion, two hundred forty-three million, four hundred ten thousand, one hundred thirty-nine".